*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  font-size: 16px;
  min-width: 1200px;
  font-family: 'Roboto', sans-serif;
  overflow-y: auto;
  scrollbar-gutter: stable; /* 保证滚动条出现时不会改变布局 */
}

ul>li {
  list-style: none;
}